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| 型号： | LP2980AIM5-4.7 |
| 厂商： | National Semiconductor |
| 文件页数： | 12/24页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 4.7V 50MA SOT23-5 |
| 标准包装： | 1,000 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 4.7V |
| 输入电压： | 最高 16V |
| 电压 - 压降（标准）： | 0.12V @ 50mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 50mA |
| 电流 - 限制（最小）： | 100mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SC-74A，SOT-753 |
| 供应商设备封装： | SOT-23 |
| 包装： | 带卷 (TR) |
| 其它名称： | *LP2980AIM5-4.7 |
SNOS733M – APRIL 2000 – REVISED JUNE 2013
V IN
V OUT
PNP
GND
Figure 37. LP2980 Reverse Current Path
However, if the input voltage is more than a V BE below the output voltage, this diode will turn ON and current will
flow into the regulator output. In such cases, a parasitic SCR can latch which will allow a high current to flow into
the V IN pin and out the ground pin, which can damage the part.
The internal diode can also be turned on if the input voltage is abruptly stepped down to a voltage which is a V BE
below the output voltage.
In any application where the output voltage may be higher than the input voltage, an external Schottky diode
must be connected from V IN to V OUT (cathode on V IN , anode on V OUT . See Figure 38 ), to limit the reverse voltage
across the LP2980-N to 0.3V (See ABSOLUTE MAXIMUM RATINGS ).
SCHOTTKY DIODE
V IN
V OUT
PNP
GND
Figure 38. Adding External Schottky Diode Protection
ON/OFF INPUT OPERATION
The LP2980-N is shut off by pulling the ON/OFF input low, and turned on by driving the input high. If this feature
is not to be used, the ON/OFF input should be tied to V IN to keep the regulator on at all times (the ON/OFF input
must not be left floating).
To ensure proper operation, the signal source used to drive the ON/OFF input must be able to swing above and
below the specified turn-on/turn-off voltage thresholds which ensure an ON or OFF state (see ELECTRICAL
The ON/OFF signal may come from either a totem-pole output, or an open-collector output with pull-up resistor to
the LP2980-N input voltage or another logic supply. The high-level voltage may exceed the LP2980-N input
voltage, but must remain within the Absolute Maximum Ratings for the ON/OFF pin.
It is also important that the turn-on/turn-off voltage signals applied to the ON/OFF input have a slew rate which is
greater than 40 mV/ μ s.
IMPORTANT: The regulator shutdown function will not operate correctly if a slow-moving signal is used to drive
the ON/OFF input.
12
Product Folder Links: LP2980-N
Copyright ? 2000–2013, Texas Instruments Incorporated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LP2980AIM5-5.0 | 功能描述:低压差稳压器 - LDO RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| LP2980AIM5-5.0 | 制造商:Texas Instruments 功能描述:V REG LDO +5.0V SMD 2980 SOT235 |
| LP2980AIM5-5.0/NOPB | 功能描述:低压差稳压器 - LDO Micropower 50 mA Ultra LDO Regulator RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| LP2980AIM5X-1.8 | 制造商:Rochester Electronics LLC 功能描述:50MA 1.8V SOT UPWR ULTRA LDO - Bulk 制造商:Texas Instruments 功能描述: |
| LP2980AIM5X-1.8/NOPB | 功能描述:IC REG LDO 1.8V 50MA SOT23-5 RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:1 系列:- 稳压器拓扑结构:正，固定式 输出电压:4V 输入电压:最高 16V 电压 - 压降（标准）:0.28V @ 150mA 稳压器数量:1 电流 - 输出:150mA 电流 - 限制（最小）:- 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:5-VFBGA 供应商设备封装:5-uSMD 包装:Digi-Reel® 其它名称:LP2985AIBP-4.0DKR |
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